unittests: change self.assertEquals to self.assertEqual

The unittest module has deprecated the former name.

BUG=chromium:980619
TEST=`cros lint` is unchanged

Change-Id: I2b93cc6079d1bf49950ec0cdef7a4edcdf5535ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/1810597
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/cros_generate_sysroot_unittest.py b/scripts/cros_generate_sysroot_unittest.py
index 9848048..95a1b45 100644
--- a/scripts/cros_generate_sysroot_unittest.py
+++ b/scripts/cros_generate_sysroot_unittest.py
@@ -81,7 +81,7 @@
   def testDefaultTargetName(self):
     """We are getting the right default target name."""
     options = self._Parse([])
-    self.assertEquals(
+    self.assertEqual(
         options.out_file, 'sysroot_chromeos-base_chromeos-chrome.tar.xz')
 
   def testMultiplePkgsTargetName(self):
@@ -91,7 +91,7 @@
         ['--board', BOARD, '--out-dir', self.tempdir,
          '--package', pkgs])
 
-    self.assertEquals(
+    self.assertEqual(
         options.out_file, 'sysroot_chromeos-base_chromeos-chrome.tar.xz')
 
   def testExistingTarget(self):